1. On some addition theorems in groups;Diderrich,1972
2. Representations by kth powers in GF(q);Diderrich;J. of Number Theory,1972
3. Combinatorial problems in Finite Abelian groups;Diderrich,1973
4. On the addition of residue classes mod p;Erdös;Acta Arith.,1964
5. Inequalities;Hardy,1934